(Now I ask you - how many of these Treasury employees do you expect to be prosecuted for FRAUD etc?
Here we are thirty years later and you wish to make excuses for the Federal Government not having said referential integrity in their money-handling systems? A system where, by law and accounting standard, every credit must have an exactly equal debit yet that is not actually enforced and in 2016 the Senate Budget Committee identified $310 billion that was illegally spent because the programs were EXPIRED and, had referential integrity been enforced the payments could not have been entered as attempting to code a payment against said program would have failed at the point of voucher entry.
That's not a mistake and by the way it wasn't "2 or 3%" either; just among expired programs it was eight percent, approximately, as the Federal Government at the time was ~3.8 trillion and every single penny of that was, from a legal perspective, STOLEN.
That report came out nearly a decade ago and Treasury did not fix it. That's intentional.
Now you must add to that how much more in actual fraud within programs that were authorized to get the actual amount stolen.
Do not kid yourself that this is a "small thing" either; Treasury did not actually require the offsetting Congressional Appropriation field to be filled in and the total of such "blank" payments was nearly $8 trillion thus far identified. Without that field filled in while you do know who the payment went to you have no means to enforce the limit of Congressional appropriation since to enforce that and refuse to pay beyond the appropriation you must know what appropriation each payment is applied against and which satisfies the other side of the G/L where that obligation rests and which it is counted against.
In other words there are no spending limits without this and Treasury deliberately allowed that to occur! Exactly how much was spent beyond appropriated limits, every penny of which is by definition fraud, is not yet known but that there was no mechanism to prevent is now known. That was not an accident and it extends back for more than two decades without any legitimate excuse.